use go-version-file in CI workflows instead of hardcoded versions

Use go-version-file: 'go.mod' so CI automatically picks up the Go
version from go.mod, avoiding future version drift. Reordered
checkout before setup-go in go.yml and e2e.yml so go.mod is
available. Removed the now-unused GO_VERSION env vars.

.github/workflows/e2e.yml

@@ -23,14 +23,13 @@ jobs:
     runs-on: ubuntu-22.04
     timeout-minutes: 30
     steps:
-    - name: Set up Go 1.x
-      uses: actions/setup-go@a5f9b05d2d216f63e13859e0d847461041025775 # v2
-      with:
-        go-version: ^1.13
-      id: go
-
     - name: Check out code into the Go module directory
-      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v2
+      uses: actions/checkout@v6
+
+    - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version-file: 'go.mod'
 
     - name: Set up Docker Buildx
       uses: docker/setup-buildx-action@v4

.github/workflows/go.yml

@@ -19,13 +19,12 @@ jobs:
     name: Go Vet
     runs-on: ubuntu-latest
     steps:
-    - name: Set up Go 1.x
-      uses: actions/setup-go@a5f9b05d2d216f63e13859e0d847461041025775 # v2
-      with:
-        go-version: ^1.13
-      id: go
     - name: Check out code into the Go module directory
-      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v2
+      uses: actions/checkout@v6
+    - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version-file: 'go.mod'
     - name: Get dependencies
       run: |
         cd weed; go get -v -t -d ./...
@@ -42,13 +41,12 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
     steps:
-    - name: Set up Go 1.x
-      uses: actions/setup-go@a5f9b05d2d216f63e13859e0d847461041025775 # v2
-      with:
-        go-version: ^1.13
-      id: go
     - name: Check out code into the Go module directory
-      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v2
+      uses: actions/checkout@v6
+    - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version-file: 'go.mod'
     - name: Build
       run: cd weed; go build -tags "elastic gocdk sqlite ydb tarantool tikv rclone" -v .
 
@@ -56,12 +54,11 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
     steps:
-    - name: Set up Go 1.x
-      uses: actions/setup-go@a5f9b05d2d216f63e13859e0d847461041025775 # v2
-      with:
-        go-version: ^1.13
-      id: go
     - name: Check out code into the Go module directory
-      uses: actions/checkout@8e8c483db84b4bee98b60c0593521ed34d9990e8 # v2
+      uses: actions/checkout@v6
+    - name: Set up Go
+      uses: actions/setup-go@v6
+      with:
+        go-version-file: 'go.mod'
     - name: Test
       run: cd weed; go test -tags "elastic gocdk sqlite ydb tarantool tikv rclone" -v ./...

.github/workflows/metadata-subscribe-tests.yml

@@ -30,7 +30,6 @@ permissions:
   contents: read
 
 env:
-  GO_VERSION: '1.24'
   TEST_TIMEOUT: '10m'
 
 jobs:
@@ -43,10 +42,10 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v6
       
-    - name: Set up Go ${{ env.GO_VERSION }}
+    - name: Set up Go
       uses: actions/setup-go@v6
       with:
-        go-version: ${{ env.GO_VERSION }}
+        go-version-file: 'go.mod'
         
     - name: Build SeaweedFS
       run: |

.github/workflows/sftp-tests.yml

@@ -24,7 +24,6 @@ permissions:
   contents: read
 
 env:
-  GO_VERSION: '1.24'
   TEST_TIMEOUT: '15m'
 
 jobs:
@@ -37,10 +36,10 @@ jobs:
     - name: Checkout code
       uses: actions/checkout@v6
       
-    - name: Set up Go ${{ env.GO_VERSION }}
+    - name: Set up Go
       uses: actions/setup-go@v6
       with:
-        go-version: ${{ env.GO_VERSION }}
+        go-version-file: 'go.mod'
         
     - name: Install dependencies
       run: |

.github/workflows/volume-server-integration-tests.yml

@@ -28,7 +28,6 @@ permissions:
   contents: read
 
 env:
-  GO_VERSION: '1.24'
   TEST_TIMEOUT: '30m'
 
 jobs:
@@ -46,10 +45,10 @@ jobs:
       - name: Checkout code
         uses: actions/checkout@v6
 
-      - name: Set up Go ${{ env.GO_VERSION }}
+      - name: Set up Go
         uses: actions/setup-go@v6
         with:
-          go-version: ${{ env.GO_VERSION }}
+          go-version-file: 'go.mod'
 
       - name: Build SeaweedFS binary
         run: |